IMPLANT FOR STABILIZING FRACTURED OR NON-FRACTURED BONES

Description

[0001] The invention relates to a bone implantaccording to the independent claim.

[0002] Bone implants are widely used for stabilizing fractured bones.

[0003] US 2009/0157078 for example discloses a cannulated screw for repairing defects in the humerus or the femur. Part of the screw does not contain a thread but holes through which cement may be introduced into a void into the bone. This device comprises a screw head on one side of the implant which requires the screw to partly extend outside the bone. The other end of the implant is threaded so that the screw is only fixed in case the thread can be fixed inside the bone on the side opposite of the screw head. Such an implant is limited in its applications.

[0004] WO 2012/142032 discloses a method and a device for bone preparation. The device comprises an insertion structure with perforations through which a fluid may be introduced into the bone. The device may be used for internal fixation of fractions or can be implemented into possibly weak and/or cancerous bone. The fluid may be bone cement. The implant part of the device is fixed on the outside of the bone and is therefore very complicated. Furthermore, several implants are used in one bone, which weakens the bone tissue due to the number of introduction channels.

[0005] WO 2012/066236 is directed to a device combining two intersecting implants for preventive or curative treatment of fractures of the femur. The intersecting implants are fixed relative to each other and thereby prevent any movement of the implants. Such a device can only be applied in bones that allow for intersecting implants. Document WO2013/079753 A1 discloses an implant according to the preamble of claim 1.

[0006] It is therefore an object of the present invention to avoid the drawbacks of the prior art and to create a bone implant which can be versatilely used in different bones of the human body and allows for a stable positioning inside the bone.

[0007] The object is accomplished by a bone implant for stabilizing fractured or non-fractured bones comprising an implant body which preferably is a cylindrical body. The implant body extends along a longitudinal axis from a front side to an end side. The implant body has an implant width expending perpendicularly to the longitudinal axis, wherein a length of the implant body along the longitudinal axis is at least five times the implant width. The implant body has an outer surface which is at least divided into a first surface and a second surface wherein the first surface consists of an anchorage area which extends at least partially over the outer surface, preferably maximum over half of the outer surface.

[0008] The anchorage area according to the invention comprises a surface that improves the fixation of the implant when implanted in a bone. The bone tissue can more easily grow into the implant and the anchorage of the implant in the bone is improved.

[0009] Such an implant is easily introduced and fixed inside a bone, especially a vertebra. The anchorage area preferably is located at the proximal end of the implant when implanted into a bone.

[0010] The implant body preferably has a constant implant width at least across the first surface and the second surface. Furthermore the implant does not comprise a widening on the proximal end like for example a screw head. Hence, preferably the implant width is constant over at least the first and the second surface, while the implant width in other areas only may be smaller.

[0011] The first surface and the second surface respectively preferably extend along the longitudinal axis and 360° around the longitudinal axis.

[0012] The implant can comprise a bore extending along the longitudinal axis or parallel to the longitudinal axis having at least one, preferably two openings at the front side and/or at the end side.

[0013] A bore inside the bone implant leads to a lighter implant and in case of two openings the possibility of introduction of fluids into the bone.

[0014] The length of the bone implant can be in a range from 10 mm to 250 mm.

[0015] The specific bone implant can be used for different bones and still has a length needed for stabilizing the respective bone.

[0016] The width of the bone can be in a range from 5 mm (for ribs)to 50 mm (for femoral diaphysis) or 80 mm (for humeral head). The width of the bone implant can be in a range from 2mm to 10mm.

[0017] Such a bone implant can easily be introduced into a bone without destroying further bone tissue and nevertheless delivers enough stability to serve its purpose of stabilizing the bone.

[0018] The second surface comprises holes having a wall around a hole axis.

[0019] The bone implant having holes on the outer surface or second surface respectively on the one hand leads to the possibility of bone tissue growing into the holes and thereby improving positioning of the implant and in case of bone implant having a bore leading to the possibility of directing fluid into the bone tissue around the implant, where holes are located.

[0020] The fluid preferably is bone cement, such as PMMA bone cement, bio-resorbable bone cement or any other product allowing implant fixation in a bone.

[0021] The holes can have a diameter of 0.2 mm to 5 mm on the outer surface or the second surface respectively.

[0022] Through such a hole bone tissue can quickly grow in and fluid, such as bone cement, can easily be introduced into the bone.

[0023] The walls of the holes can have a cylindrical, preferably a conical shape.

[0024] Cylindrical holes are easy to manufacture and thereby lower manufacturing costs and the conical shape optimizes the distribution of the fluid that is introduced into the bone through the bone implant.

[0025] The implant comprises a first set of holes, wherein the hole axis of the first set of holes is arranged substantially perpendicular to the longitudinal axis.

[0026] A set of holes can comprise one or more holes.

[0027] A hole with a hole axis arranged perpendicular to the longitudinal axis leads to the distribution of fluid through the hole radially away from the implant and thus the bone cement reaches as far as possible.

[0028] The implant can comprise a second set of holes, wherein the hole axis of the second set of holes is inclined relative to the longitudinal axis, preferably inclined as an angle greater than 90° while smaller than 150° relative to the longitudinal axis.

[0029] An inclined hole axis enables the distribution of a fluid to a specific point inside the bone when the implant is placed inside the bone.

[0030] The implant can comprise a third set of holes, wherein the hole axis of the third set of holes is inclined relative to the longitudinal axis at an angle different from the second set of holes, preferably inclined at an angle smaller than 90° while larger than 30° relative to the longitudinal axis.

[0031] An inclined hole axis enables the distribution of a fluid inside the bone to a specific area when the implant is already inside the bone. Furthermore, inclined holes enable the introduction of bone cement even in sensitive areas of nerves, since it is possible to direct the flow of the cement into specific areas.

[0032] Especially a combination of the first, second and third set of holes enables the direction of fluid from inside the implant to specific areas of the bone relative to the implant.

[0033] The holes are distributed substantially equal in an area of 360° around the longitudinal axis of the outer surface or the second surface and preferably distributed in rows along the longitudinal axis such that a distance between neighbouring holes in a row is substantially the same.

[0034] Such an arrangement allows for an optimised distribution of fluid and a uniform distribution of tissue growing into the implant.

[0035] The holes can be located in an area from 180° to 270° around a longitudinal axis on the outer surface or the second surface and preferably distributed in rows along the longitudinal axis such that the distance between neighbouring holes and a row is substantially the same.

[0036] The arrangement of the holes in an area from 180° to 270° around the longitudinal axis leads to the possibility of directing fluid through the implant only to a part of the bone, where the fluid is needed.

[0037] A first hole of a first row and a first hole of a second neighbouring row have a different distance to the front side, the difference in the distance being equal to half the distance of two neighbouring holes in a row.

[0038] Such a distribution of neighbouring holes of neighbouring rows leads to an optimised distribution of fluid being introduced through the implant into the bone.

[0039] The distribution of holes is preferably chosen such that the stability of the implant is not, or not significantly compromised and nevertheless the distribution of fluid is optimal for the specific situation. In spine, the holes will be placed in the distal part of the implant which is implanted in the vertebral body, and the holes will be arranged such that cement is injectable at 270 to 300° around the longitudinal axis, not on the side of an upper endplate to avoid leakage in case of endplate fracture.

[0040] In the humerus application, the holes are placed all along the implant, at 360° around the longitudinal axis, to allow a 360° cement flow. This allows a good implant fixation, a bone reinforcement and to full fill tumour if applicable.

[0041] The anchorage area can comprise means for improving the fixation of the implant within a bone, said means encompassing a roughness, and preferably further comprising a surface structure and/or recesses.

[0042] The surface structure can be grooves, a thread or a ring shaped structure, while the thread or groove pitches or ring structures can be square, symmetrically triangular or asymmetrically triangular. Alternatively or additionally, the surface structure can comprise recesses that are straight, helicoidal or comprise crossed or diamond shaped pitches. A recess in the anchorage area can be from 0.5mm to 3 mm deep.

[0043] All depth values according to this invention are measured from top to bottom. Of course statistical variations can occur.

[0044] A surface structure improves the anchorage of the implant.

[0045] The roughness varies from 1 micrometer to 0,5mm.

[0046] The anchorage area can comprise a surface structure in form of grooves, preferably 6 or 8 grooves, distributed substantially equally around the longitudinal axis, extending coaxially along the longitudinal axis.

[0047] The grooves can have the same shape and/or height as the recesses and surface structures being a thread or ring shaped.

[0048] The use of surface structures in form of grooves improves the anchorage of the implant and therefore leads to a more durable and safer implant.

[0049] The anchorage area can comprise a surface structure in form of a thread or ring shaped grooves. Such an anchorage area improves the fixation of the implant inside the bone.

[0050] A cross section of the grooves can be U-shaped, V-shaped or square. By means of the grooves, the surface contact between the bone and the implant is increased and stress concentration on the bone is limited. It also allows implant stabilisation in rotation before the cement injection, which is for example important for spinal implants where the injection holes have to be oriented. After cement injection the implant stabilisation is done by the cement e.g. stabilisation of the implant in rotation and translation.

[0051] The implant can comprise a fixation connector allowing holding of the implant during introduction into a bone.

[0052] The fixation connector can for example be a thread by means of which the bone implant is connected to a tool. Preferably the fixation connector is a thread on the inside of the bore of the bone implant, while the inner thread preferably has a wider diameter than the rest of the bore to improve an easy introduction of a tool. By means of such an inner thread, the outer surface can be optimized for fixation of the implant inside the bone.

[0053] Furthermore, the fluid can be introducible through the tool and the implant when connected by the fixation connector. This leads to any easy handling of the implant when introducing and fixing the implant.

[0054] The outer surface can comprise a third surface having an at least partially conical shape. Such a third surface is arranged opposite of the anchorage surface and leads to the possibility of easier introducing the bone implant into the bone.

[0055] The implant can be made from any implantable material, such as PEEK, titanium, stainless steel or Nitinol or a combination thereof.

[0056] The implant as previously described can be used for restoring a fractured bone.

[0057] The implant as previously described can be used for preventing a fracture in a bone.

[0058] Fractured bones can for example be the humeral head or diaphysis, the calcaneus, the wrist radius, the tibia, the pelvis or the ribs. Examples for an application for preventing the fracture of the bone is e. g. the humerus or the ribs or spinal vertebral body for example in case of severe osteoporosis or lytic lesion tumour induced.

[0059] Also described herein although not falling within the scope of the claim is method of stabilizing a fractured or non-fractured bone by inserting a bone implant as previously described into a bone and preferably introducing bone cement into the bone through the bone implant.

[0060] Such a method leads to an easy introduction and fixation of the bone implant inside the bone without the need of any plates or additional fixation means.

[0061] In the following figures six embodiments of exemplary bone implants are shown. Only the first, third, fourth and fifth embodiment fall within the scope of the invention as claimed:

Figure 1:

a bone implant in a first embodiment,

Figure 2:

a first section of a bone implant in a second embodiment

Figure 3:

a cross-section through a bone implant in a third embodiment,

Figure 4:

a bone implant in a fourth embodiment,

Figure 5:

a cross-section through a bone implant according to figure 4,

Figure 6:

a bone implant in a fifth embodiment,

Figures 6a to 6c:

a detailed view of figure 6,

Figure 7:

a cross-section through a bone implant in a sixth embodiment

Figure 8:

two bone implants stabilizing a fracture in a vertebra,

Figure 9:

two implants according to the third embodiment for stabilizing a fracture in a vertebra,

Figure 10:

a bone implant according to the first embodiment for stabilizing the humerus.

[0062] Figure 1 shows a bone implant 1 according to a first embodiment. The bone implant 1 comprises an implant body 2 having a longitudinal axis 3. The implant body 2 comprises a front side 4 and an end side 5. Additionally, the implant body 2 is separated into a first surface 7 and a second surface 8. The first surface 7 comprises an anchorage area 9 for improving the anchorage of the implant in a bone. Perpendicular to the longitudinal axis, the implant body 2 comprises an implant width 6. The implant width 6 is constant along the first surface 7 and the second surface 8 and not exceeded at any other point of the implant 1. The second surface 8 comprises holes 12 and a bore 10 inside the implant body 2. The holes 12 enable the introduction of a fluid such as bone cement through the implant 1 into the bone and optimize the fixation of the implant 1 inside the bone due to growing bone tissue into the holes 12. The implant body 2 further comprises a third surface 17 which has a conical shape. The width of the implant is reduced in the third surface such that the introduction of the implant 1 into the bone is easier. The front side 4 of the implant body 2 is rounded such that it forms a semi-sphere to facilitate introduction of the implant 1 into the bone. The anchorage area 9 of the first surface 7 comprises a surface structure for improving the anchorage of the implant 1 inside the bone. The holes are distributed 360° around the circumference of the implant body 2, while the holes 12 are arranged in rows. The rows are offset relative to each other such that a first hole 12 of a first row 18 has a different distance from the front side 4 than a first hole 12 of a second neighbouring row (not shown). The length of an implant body is 100 mm while the implant width is 5 mm. The diameter of the holes 12 is 2.5 mm. The wall of the holes 12 has a cylindrical shape.

[0063] For example values for standard spinal implant will be: length from 50 to 85mm, preferably mean 70mm, diameter from 4 to 7mm, preferably 5mm, holes from 1mm to 3mm. preferably 2-2,5mm.

[0064] Figure 2 shows a cross-section through a second embodiment of the bone implant, this embodiment not falling within the scope of the claims. In this embodiment, the implant body 2 comprises a bore 10 along the longitudinal axis. On the end side 5 a fixation connector is arranged to enable a connection of the implant body 2 with an insertion tool (not shown). Contrary to the first embodiment in figure 1, the holes 12 in the second embodiment are arranged over a larger second surface 8 relative to a smaller first surface 7. A first set of holes 12 comprises a hole axis 11a which is arranged perpendicular to the longitudinal axis 3. A second set of holes comprises an inclined axis 11b, while the inclination of the hole axis 11b is 120° relative to the longitudinal axis 3. The front side 4 further comprises a third surface 17 for facilitating introduction of the implant into a bone.

[0065] Figure 3 shows a cross section of a third embodiment of the invention. In this embodiment the bore 10 comprises a fixation connector 16 on the end side 5 of the implant body 2 which is threaded. By means of this thread a tool can be fixed in the implant. The holes 12 are arranged 270° around the longitudinal axis 13 and hence a fluid such as bone cement is only directed 260° from the implant. This way, sensitive areas will not be filled with fluid or specific bone cement.

[0066] Figure 4 shows a fourth embodiment of the invention. This embodiment corresponds to the first embodiment in figure 1 apart from the first surface 7 comprising the anchorage area 9. The anchorage area 9 comprises a thread in which the thread pitches extend from the implant width 6. Such an anchorage area 9 improves the fixation of the implant inside the bone. Furthermore, the third surface 17 in this embodiment is shorter relative to the embodiment in figure 1 and thereby a conical shape of the third surface 17 comprises a steeper inclination relative to the embodiment in figure 1. Additionally, the front side 4 is more peaked relative to the embodiment in figure 1.

[0067] Figure 2 shows the embodiment as disclosed in figure 3 while the first surface 7 comprises an anchorage area 9 having a thread. The anchorage area 9 in this embodiment corresponds to the anchorage area 9 shown in figure 4.

[0068] Figure 6 shows an embodiment of the implant 1 which comprises a first surface 7 having longitudinal grooves 13, this embodiment not falling within the scope of the claims. The longitudinal 13 grooves improve the anchorage of the bone implant inside the bone. The longitudinal grooves can comprise a cross-sectional shape that is square, such that it avoids rotation (figure 6a), semi-spherical such that insertion is easier and the bone contact is better compared to square shapes or angles(figure 6b) or triangular such that the surface contact is maximised(figure 6c). The holes 12 in the embodiment according to figure 6 are only distributed from 270° up to 300° around the circumference of the implant 1.

[0069] Figure 7 shows a cross-section through the embodiment according to figure 6. The bore 10 along the longitudinal axis 3 comprises a fixation connector 16 which enables a threaded connection to a tool (not shown). The holes 12 are arranged along three different hole axis 11a to 11c. The first hole axis 11a is arranged perpendicular to the longitudinal axis. The hole axis 11b for the second set of holes is arranged at 130° relative to the longitudinal axis 3. The hole axis 11c for the third set of holes is arranged at 60° relative to the longitudinal axis. Such a hole arrangement is especially suitable for an implant in a vertebra since bone cement introduced through the bore 10 and holes 12 is optimally distributed in the vertebra. The purpose is to avoid the risk of leakage through the vertebral body walls, anterior or posterior, that could have been damaged by a fracture.

[0070] Figures 8a to 8c show an exemplary embodiment of the use of the implant in a vertebra. Figure 8a shows the top view, figure 8b shows a side view and figure 8c shows a rear view from a vertebra in which two implants are introduced for stabilizing the vertebra. The implants introduced in this embodiment are implants according to figure 1.

[0071] Figures 9a to 9c show the same views as figure 8 applying an embodiment of the implant according to figure 4.

[0072] Figure 10 shows an implant 1 used as a stabilizing implant in a humerus. The humerus is not fractured. The implant 1 is nevertheless introduced into the bone for stabilizing it. The arrow shows the way of introducing implant 1 into the humerus.

Claims

1. Bone implant (1) for stabilizing fractured or non-fractured bones, said implant comprising an implant body (2), preferably a cylindrical body, extending along a longitudinal axis (3) from a front side (4) to an end side (5) and having an implant width (6) extending perpendicularly to the longitudinal axis (3), wherein a length of the implant body (2) along the longitudinal axis (3) is at least 5 times the implant width (6), wherein the implant body (2) has an outer surface, being at least divided into a first surface (7) and a second surface (8), wherein the first surface (7) consists of an anchorage area (9) which extends at least partially over the outer surface, preferably maximum over half of the outer surface wherein the implant does not comprise a widening on a proximal end, wherein the second surface (8) comprises holes (12) having a wall around a hole axis (11), wherein all holes (12) are distributed substantially equally in an area of 360° around the longitudinal axis (3) of the second surface (8) and in rows along the longitudinal axis (3),wherein in each row there are three holes (12) such that a distance between neighbouring holes (12) in the row is substantially the same, wherein the anchorage area (9) comprises means for improving the fixation of the implant within a bone, wherein the means for improving the fixation encompasses a roughness, characterised in that the roughness is in a range from 1 micrometer to 0.5 mm depth, and in that the rows are offset relative to each other, such that a first hole of a first row and a first hole of a second neighbouring row have a different distance to the front side, the difference in the distance being equal to half the distance of two neighbouring holes in a row.

2. Bone implant (1) according to claim 1, characterized in that the implant (1) comprises a bore (10) extending along the longitudinal axis (3) or parallel to the longitudinal axis (3) having at least one, preferably two, openings at the front side and/or at the end side.

3. Bone implant (1) according to any one of the preceding claims characterized in that the length of the bone implant is in a range from 10 mm to 250 mm.

4. Bone implant (1) according to any one of the preceding claims characterized in that the width (6) of the bone implant is in a range from 2 mm to 10 mm.

5. Bone implant (1) according to claim 4,
characterized in that the implant (1) comprises a first set of holes (12), wherein the hole axis (11a) of the first set of holes (12) is arranged substantially perpendicular to the longitudinal axis.

6. Bone implant (1) according to any one of claims 4 to 5,
characterized in that the implant comprises a second set of holes (12), wherein the hole axis (11b) of the second set of holes (12) is inclined relative to the longitudinal axis (3), preferably inclined at an angle greater than 90° while smaller than 150° relative to the longitudinal axis (3).

7. Bone implant (1) according to any one of claims 4 to 6,
characterized in that the holes (12) are located in an area from 180° to 270° around the longitudinal axis on the outer surface or the second surface and preferably distributed in rows along the longitudinal axis such that a distance between neighbouring holes in a row is substantially the same.

8. Bone implant (1) according to any one of the preceding claims, characterized in that the anchorage area (9) comprises surface structures in form of grooves (13), preferably 6 or 8 grooves, distributed substantially equally around the longitudinal axis, extending coaxially along the longitudinal axis.

9. Bone implant (1) according to any one of claims 1 to 8, characterized in that the anchorage area (9) comprises surface structures in form of a thread (14) or ring shaped grooves (15).

Ansprüche

1. Knochenimplantat (1) zur Stabilisierung von gebrochenen oder nicht gebrochenen Knochen, mit einem Implantatkörper (2), vorzugsweise einem zylindrischen Körper, der sich entlang einer Längsachse (3) von einer Stirnseite (4) zu einer Endseite (5) erstreckt und eine senkrecht zur Längsachse (3) verlaufende Implantatbreite (6) aufweist, wobei eine Länge des Implantatkörpers (2) entlang der Längsachse (3) mindestens das Fünffache der Implantatbreite (6) beträgt, wobei der Implantatkörper (2) eine Außenfläche aufweist, die zumindest in eine erste Fläche (7) und eine zweite Fläche (8) unterteilt ist, wobei die erste Fläche (7) aus einem Verankerungsbereich (9) besteht, der sich zumindest teilweise über die Außenfläche erstreckt, vorzugsweise maximal über die Hälfte der Außenfläche, wobei das Implantat keine Verbreiterung an einem proximalen Ende aufweist, wobei die zweite Fläche (8) Löcher (12) mit einer Wand um eine Lochachse (11) aufweist, wobei alle Löcher (12) im Wesentlichen gleichmäßig in einem Bereich von 360° um die Längsachse (3) der zweiten Fläche (8) und in Reihen entlang der Längsachse (3) verteilt sind, wobei in jeder Reihe drei Löcher (12) vorhanden sind, so dass ein Abstand zwischen benachbarten Löchern (12) in der Reihe im Wesentlichen gleich ist, wobei der Verankerungsbereich (9) Mittel zum Verbessern der Fixierung des Implantats in einem Knochen umfasst, wobei das Mittel zum Verbessern der Fixierung eine Rauheit umfasst, dadurch gekennzeichnet, dass die Rauheit in einem Bereich von 1 Mikrometer bis 0. 5 mm Tiefe liegt, und dass die Reihen relativ zueinander versetzt sind, so dass ein erstes Loch einer ersten Reihe und ein erstes Loch einer zweiten benachbarten Reihe einen unterschiedlichen Abstand zur Vorderseite haben, wobei die Differenz des Abstandes gleich der Hälfte des Abstandes von zwei benachbarten Löchern in einer Reihe ist.

2. Knochenimplantat (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Implantat (1) eine sich entlang der Längsachse (3) oder parallel zur Längsachse (3) erstreckende Bohrung (10) mit mindestens einer, vorzugsweise zwei, Öffnungen an der Stirnseite und/oder an der Endseite aufweist.

3. Knochenimplantat (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Länge des Knochenimplantats in einem Bereich von 10 mm bis 250 mm liegt.

4. Knochenimplantat (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Breite (6) des Knochenimplantats in einem Bereich von 2 mm bis 10 mm liegt.

5. Knochenimplantat (1) nach Anspruch 4, dadurch gekennzeichnet, dass das Implantat (1) einen ersten Satz von Löchern (12) umfasst, wobei die Lochachse (11a) des ersten Satzes von Löchern (12) im Wesentlichen senkrecht zur Längsachse angeordnet ist.

6. Knochenimplantat (1) nach einem der Ansprüche 4 bis 5, dadurch gekennzeichnet, dass das Implantat einen zweiten Satz von Löchern (12) aufweist, wobei die Lochachse (11b) des zweiten Satzes von Löchern (12) relativ zur Längsachse (3) geneigt ist, vorzugsweise in einem Winkel größer als 90° und kleiner als 150° relativ zur Längsachse (3) geneigt ist.

7. Knochenimplantat (1) nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die Löcher (12) in einem Bereich von 180° bis 270° um die Längsachse auf der Außenfläche oder der zweiten Fläche angeordnet sind und vorzugsweise in Reihen entlang der Längsachse verteilt sind, so dass ein Abstand zwischen benachbarten Löchern in einer Reihe im Wesentlichen gleich ist.

8. Knochenimplantat (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Verankerungsbereich (9) Oberflächenstrukturen in Form von Rillen (13), vorzugsweise 6 oder 8 Rillen, aufweist, die im Wesentlichen gleichmäßig um die Längsachse verteilt sind und sich koaxial entlang der Längsachse erstrecken.

9. Knochenimplantat (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Verankerungsbereich (9) Oberflächenstrukturen in Form eines Gewindes (14) oder ringförmiger Nuten (15) aufweist.

Revendications

1. Implant osseux (1) pour stabiliser des os fracturés ou non, ledit implant comprenant un corps d'implant (2), de préférence un corps cylindrique, s'étendant le long d'un axe longitudinal (3) depuis une face avant (4) à une face arrière (5) et ayant une largeur d'implant (6) s'étendant perpendiculairement à l'axe longitudinal (3), dans lequel une longueur du corps d'implant (2) le long de l'axe longitudinal (3) est au moins 5 fois la largeur de l'implant (6), dans lequel le corps d'implant (2) a une surface extérieure, étant au moins divisée en une première surface (7) et une seconde surface (8), dans lequel la première surface (7) consiste en une zone d'ancrage (9) qui s'étend au moins partiellement sur la surface extérieure, de préférence au maximum sur la moitié de la surface extérieure, dans lequel l'implant ne comprend pas d'élargissement sur une extrémité proximale, dans lequel la seconde surface (8) comprend des trous (12) ayant une paroi autour d'un axe de trou (11), dans lequel tous les trous (12) sont répartis de manière sensiblement égale dans une zone de 360° autour de l'axe longitudinal (3) de la seconde surface (8) et en rangées le long de l'axe longitudinal (3), dans lequel, dans chaque rangée, il y a trois trous (12) de sorte qu'une distance entre des trous voisins (12) dans la rangée est sensiblement la même, dans lequel la zone d'ancrage (9) comprend des moyens pour améliorer la fixation de l'implant dans un os, dans lequel les moyens pour améliorer la fixation comprennent une rugosité, caractérisé en ce que la rugosité est dans une gamme de 1 micromètre à 0,5 mm de profondeur, et en ce que les rangées sont décalées les unes par rapport aux autres, de sorte qu'un premier trou d'une première rangée et un premier trou d'une deuxième rangée voisine ont une distance différente par rapport au face avant, la différence de distance étant égale à la moitié de la distance de deux trous voisins dans une rangée.

2. Implant osseux (1) selon la revendication 1, caractérisé en ce que l'implant (1) comprend un alésage (10) s'étendant le long de l'axe longitudinal (3) ou parallèlement à l'axe longitudinal (3) ayant au moins une, de préférence deux, ouvertures au niveau de la face avant et/ou de la face arrière.

3. Implant osseux (1) selon l'une quelconque des revendications précédentes caractérisé en ce que la longueur de l'implant osseux est comprise entre 10 mm et 250 mm.

4. Implant osseux (1) selon l'une quelconque des revendications précédentes caractérisé en ce que la largeur (6) de l'implant osseux est comprise entre 2 mm et 10 mm.

5. Implant osseux (1) selon la revendication 4, caractérisé en ce que l'implant (1) comprend un premier ensemble de trous (12), l'axe des trous (11a) du premier ensemble de trous (12) étant disposé sensiblement perpendiculairement à l'axe longitudinal.

6. Implant osseux (1) selon l'une quelconque des revendications 4 à 5, caractérisé en ce que l'implant comprend un deuxième ensemble de trous (12), dans lequel l'axe de trou (11b) du deuxième ensemble de trous (12) est incliné par rapport à l'axe longitudinal (3), de préférence incliné selon un angle supérieur à 90° tout en étant inférieur à 150° par rapport à l'axe longitudinal (3).

7. Implant osseux (1) selon l'une quelconque des revendications 4 à 6, caractérisé en ce que les trous (12) sont situés dans une zone de 180° à 270° autour de l'axe longitudinal sur la surface extérieure ou la deuxième surface et de préférence répartis en rangées le long de l'axe longitudinal de telle sorte qu'une distance entre des trous voisins dans une rangée est sensiblement la même.

8. Implant osseux (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone d'ancrage (9) comporte des structures de surface en forme de rainures (13), de préférence 6 ou 8 rainures, réparties sensiblement également autour de l'axe longitudinal, s'étendant coaxialement le long de l'axe longitudinal.

9. Implant osseux (1) selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la zone d'ancrage (9) comprend des structures de surface en forme de filets (14) ou de rainures annulaires (15).

Drawing